参数资料
型号: 71M6531F-IMR/F
厂商: Maxim Integrated
文件页数: 48/121页
文件大小: 0K
描述: IC ENERGY METER 256KB 68-QFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
系列: *
Data Sheet 71M6531D/F-71M6532D/F
Table 48: EECTRL Bits for the 3-Wire Interface
FDS 6531/6532 005
Control
Bit
7
6
5
4
3:0
Name
WFR
BUSY
HiZ
RD
CNT[3:0]
Read/
Write
W
R
W
W
W
Description
Wait for Ready. If this bit is set, the trailing edge of BUSY will be delayed
until a rising edge is seen on the data line. This bit can be used during
the last byte of a Write command to cause the INT5 interrupt to occur
when the EEPROM has finished its internal write sequence. This bit is
ignored if HiZ = 0.
Asserted while the serial data bus is busy. When the BUSY bit falls, an
INT5 interrupt occurs.
Indicates that the SD signal is to be floated to high impedance immediately
after the last SCK rising edge.
Indicates that EEDATA is to be filled with data from EEPROM.
Specifies the number of clocks to be issued. Allowed values are 0
through 8. If RD=1, CNT bits of data will be read MSB first and right
justified into the low order bits of EEDATA . If RD=0, CNT bits will be sent
MSB first to the EEPROM, shifted out of the MSB of EEDATA . If
CNT[3:0] is zero, SDATA will simply obey the HiZ bit.
The timing diagrams in Figure 11 through Figure 15 describe the 3-wire EEPROM interface behavior. All
commands begin when the EECTRL register is written. Transactions start by first raising the DIO pin that
is connected to CS. Multiple 8-bit or less commands such as those shown in Figure 11 through Figure 15
are then sent via EECTRL and EEDATA .
When the transaction is finished, CS must be lowered. At the end of a Read transaction, the EEPROM
will be driving SDATA, but will transition to HiZ (high impedance) when CS falls. The firmware should
then immediately issue a write command with CNT=0 and HiZ=0 to take control of SDATA and force it to
a low-Z state.
EECTRL Byte Written
Write -- No HiZ
SCLK (output)
CNT Cycles (6 shown)
INT5
SDATA (output)
D7
D6
D5
D4
D3
D2
SDATA output Z
(LoZ)
BUSY (bit)
Figure 11: 3-Wire Interface. Write Command, HiZ=0
EECTRL Byte Written
Write -- With HiZ
SCLK (output)
CNT Cycles (6 shown)
INT5
SDATA (output)
D7
D6
D5
D4
D3
D2
SDATA output Z
(LoZ)
(HiZ)
BUSY (bit)
Figure 12: 3-Wire Interface. Write Command, HiZ=1
48
Rev 2
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